Valve-seat cutter



June 14, 1927.

E. TYDEN VALVE SEAT CUTTER Filed May 21. 1923 l I l I' All Patented .lime 1li, 192% VALVE-SEAT CUTTER.

vApplication filed May 21, 1923. l Serial No. 640,358.

` bodying this invention showing it entered in a piece ot work with the partsadjusted for such entry. Y i

Figure` 2 is a planview of thel tool with the work turned at 90 degrees to the position shown iiilig. 1 and with the tool adjusted to cutting position.

Figure 3 is an enlarged view of' the cutter vand its supporting stem adjusted as shown in Fig. 1.

Figure 4 is an enlarged View ot the cutter and its supporting -stem adjusted as in Fig. 2.

Figure 5 is an end elevation ot the tool with theirange oi' adjustment indicated in dotted lines. j

For purposes ot illustration, the piece of work shown in connection with the tool is a sprinkler head for an automatic sprinkling system in which a trame, 1, extends from the threaded stem, 2, at opposite sides oi the bore, 3, in said stem. The bore, 3, terminates within the outlines of the traine, 1, in an annular valve seat, 4, opposite which the trame is arched at 5 to carry-a boss or abutment, 6, which is located coaxially with the bore, 3, and therefore obstructs access to the seat, 4, for machining it in the ordinary manner. The purpose of this invention is to provide a tool which may be entered through the bore, 3, and adjusted to work upon the valve seat, 4, and then re-adjusted for withdrawal through the said bore, 3.

YIt may be assumed that the frame, 1, is'

carried in a special chuck, 7, by which it is rotated in a lathe -or similar machine; the drawing shows only one of two jaws ot such a chuck, the other jaw being omitted to disclose the outlines of the sprinkler head and to show the recess, 8, formed in the jaw to accommodate the part, 6, of the casting. rlllie turret head or other tool support is mounted opposite the chuck, 7, and the tool carried thereby includes a stem, 10, fitted to enter bore, 3, and yslightly reduced at its end portion, 11. -A- rock shaft, 12, is` eccentricall-y carried in the stem 10, and supports at its outer end a head, 13, whichat one vposition of adjustment ot the rock shaft, 12,

is co-aXial with the stem, 10, andV substantially equal in diameter to the reduced portion, 11. `The head, 13, is bored in a,direction at an acute angle to the longitudinal dimension of the rock shaft, trending` from 05 the end there-oi' rearward, i. e., towardv the shank to receive the cutter, 14, of tool-steel which may be secured in positionbya `set screw, 15, in the head. `The end of the reduced part, 11, ot the stem, 10, lis notched at,;1 1, to accommodate the cutter, 14, as indicated clearly in Figure, so that `when the'head, 13,- is adjusted to its concentric position, the cutter lies wholly Within the outlines oi' said head and the `stem and it 'I5 may be` readily entered through thel bore, 3,

to the position shown in Figure 1.

The main shank,`16, of the tool is, held fixed in the turret or other support` on the machine; between saidshank andthe stein 10, there is formed ailange orenlargement, 17, having a slot, 18, which accommodates the swing oan adjusting handle, 19, which is fixed to the inner endoi the-rock shaft, 12, by a suitable set screw20. Theadjust- S5 ment of the rock' shaft is very simply accomplished, by swinging the arm or handle 19, from the position shown in tull lines in Fig. 5 to the position shown in dotted lines in said iigure, whereby the rock shaft, 12, and its head, 13, are rotated through an angle ot about 90 degrees carrying the cutter, 14, outside the projected outlines ot the stem, 10, and in position Jfor encounter with the surface of the valve seat, 4, when the tool is dra-wn back slightly in the bore, 3. As the part, 1, is revolved by the chuck the cutter, 14, being adjusted to the position shown in Figure 2, works upon the valve seat for shaping and smoothing it and uponcompletion of this operation,the tool beings advanced away from the machined su1i`ace,- the cutter is returned to its original position by the swing of the adjusting handle, 19, and the tool is withdrawn through the bore, 3. The swing ot the head, 13, may be 'limited in one direction by the engagement of the cut-ter, 14, with one side of Vthe notch, 11a, and in the other direction by encounter of the arm, 19, with the Wall, 21, of the slot, 11d i 18; for convenience, this wall, 21, is cut 'E f :i straight through, the flange, 17, but it it preferred to "prevent the cutter, 14E, troni Y actually engaging the end of the notch, ll,

.Y Vthe slot, 18, may be formed with a second wall, 22, as indicated in Fig. 5, for limiting the adjustment by encounter withthe liandle, 19. Y s

I claim t Y l. AL tool for tliopurpose indicated comprising a stem, a cutter holder mounted at theforward end thereof, and a blade .fixed in the holder and provided with a cutting edge at its free extremity, said blade pro- "jecting 'from the rear face of the holder but dying entirely within the projected outline of claim l, wherein the cutter holder is eccenthe holder, and said holder being adjustable with respect to the .stem `tor shitting the cutting` edge of the blade laterally beyond the projected outline ot' the stein for operating upon atorwardly facing area of a piece of work through which the stem is protruded.

2. A tool of the character described in trically mounted within the stem, andV rol. tatable with respectthereto, for the purpose 25v of shifting the cutter blade laterally as described. v

3. A tool for the purpose indicated oomprising ay stem, ayrock shalt eccentricallyv Y j ournaled therein, a cutter holder on the end vof Ithe rock Vshaft beyondthe stem, dimen-V Qsioned to lie within the projected outline of v*the stem at one position of adjustment, said holder havin(r an obli uel 'dis ose'd bore e j Y Y P piercing the rear face thereof, means for securing a cutting blade within the bore, ad-

justable in the oblique direction of said'bore to project therefrom rearwardly but lying` 'in the stem. l.

adapted to be` extended laterally into working position by turning the rock shaft, the shank having' a transverse slotinto which the rock snaft extendsl and a handle snugly tit-ting said slot and rigidly secured to the rock shaft for turning the latter while Arethining Vit againsty longitudinal movement,

5, A tool 'for the purpose indicated coinprising a stem, a cutter holder rotatably mounted Vtherein at one end thereof, said holder having Van. obliquely disposed bore piercing?,- its rear face for receivinga' cutter blade, means for securing a blade therein with its cutting edge lyingF within the projected outline of the holder, said holder be- 'ing dimensioned for lying within the projected outline of the stem at one position of its rotative adjustment, and for carrying` the cutter outside said outline at another position of adjustment. y

ln testimony whereof, I have hereunto set my hand at Chicago, `Illinois this 18th day of May, 1923. n Y

EMIL TYDEN. 

